public Map<String, List<UserSpecialTopic>> groupListBySttId(List<UserSpecialTopic> list) {
		Map<String, List<UserSpecialTopic>> map = new HashMap<>();
		for (UserSpecialTopic specialTopic : list) {
			ImageUtil.combineImagePath(specialTopic);
			List<UserSpecialTopic> tmpList = map.get(specialTopic.getUst_stt_name());
			specialTopic.setEncrypt_ust_id(EncryptUtil.cwnEncrypt(specialTopic.getUst_id()));
			if (tmpList == null) {
				tmpList = new ArrayList<>();
				tmpList.add(specialTopic);
				map.put(specialTopic.getUst_stt_name(), tmpList);
			} else {
				tmpList.add(specialTopic);
			}
		}
		return map;
}